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Nota Lepidopterologica ZOBODAT - www.zobodat.at Zoologisch-Botanische Datenbank/Zoological-Botanical Database Digitale Literatur/Digital Literature Zeitschrift/Journal: Nota lepidopterologica Jahr/Year: 1991 Band/Volume: 14 Autor(en)/Author(s): Mentzer Erik von, Moberg Arne, Fibiger Michael Artikel/Article: Noctua janthina ([Denis & Schiffermüller]) sensu auctorum a complex of three species (Lepidoptera : Noctuidae) 25-40 ©Societas Europaea Lepidopterologica; download unter http://www.biodiversitylibrary.org/ und www.zobodat.at Nota lepid. 14 (1) : 25-40 ; 31.V.1991 ISSN 0342-7536 Noctua janthina ([Denis & Schiffermüller]) sensu auctorum a complex of three species (Lepidoptera : Noctuidae) Erik von Mentzer, Arne Moberg & Michael Fibiger Erik von Mentzer, Örnstigen 14, S-183 50 Täby, Sweden. Arne Moberg, Tussmötevägen 128, S- 122 41 Enskede, Sweden. Michael Fibiger, Molbechsalle 49, DK-4180 Soro, Denmark. Summary It is shown that what hitherto has been understood under the name Noctua janthina ([Denis & Schiffermüller] 1775) is in reality a complex of three species, of which N tenia sp. n. is described. Résumé Les auteurs montrent que ce que l'on a considéré jusqu'à présent comme une espèce, appelée Noctua janthina ([Denis & Schiffermüller] 1775), est en réalité un complexe de trois espèces, dont ils décrivent N tertia sp. n. Students of western and central European Noctuidae may have noticed the pronounced variation of the width of the marginal fascia of the hindwing upperside in what has hitherto been understood as Noctua janthina ([Denis & Schiffermüller] 1775), characterized by a medium size within the genus, variegated patagia, forewings mostly covered by a violet suffusion and hindwings with a basal black shading. The ratio between the width of the marginal fascia and that of the hindwing along a line from the wing-base to the termination of vein Axl (first axalis) ranges from 0.17-0.34 in males and 0.17-0.30 in females, with a gap between 0.23 and 0.26 in the males. The values are unevenly distributed, being concentrated at the extremes. Thus it is possible to distinguish roughly between specimens with a narrow fascia and specimens with a wide fascia. In south-eastern Europe (Yugoslavia, Bulgaria, Greece) and in Turkey specimens are found with wide fasciae which differ in a single character from specimens with wide fasciae occurring in western and central Europe. We can thus speak of specimens of three types, namely with "narrow fascia", "wide fascia 1" and "wide fascia 2". Considering the whole geographical 25 ©Societas Europaea Lepidopterologica; download unter http://www.biodiversitylibrary.org/ und www.zobodat.at distribution one finds the following differentiating characters in both sexes. Morphology Al. Narrow fascia : costal termination of fascia abrupt, with inner edge or so to cavity in middle of fascia perpendicular nearly costa ; of fascia asymmetrical, with anterior edge tending to be straight (Fig. 1). A2. Wide fascia 1 : costal termination of fascia in the shape of a wedge directed towards wing-base without reaching it, terminating in a more or less sharp point at black shading radiating from wing- base ; cavity in middle of fascia symmetrical, with a continuously rounded edge (Fig.. 2). A3. Wide fascia 2 : costal termination of fascia directed towards wing- base, terminating diffusely at black shading radiating from wing- base or before : cavity in middle of fascia symmetrical (Fig. 3). 1 2 3 Figs. 1-3. Hindwing upperside in Xocrua janthina sensu auct. 1. "Narrow fascia" (N. 1" 2" T janthina [D. & S.]). 2. "Wide fascia (TV. janthe (Bkh.)). 3. "Wide fascia (A . tenia sp. n.). X 1.5. No intermediates have been found in these characters, which permits a grouping from regions in which the width of the fascia appears to vary continuously. The following correlated characters were found : Bl. Narrow fascia : forewing upperside : ground-colour variable, from pale ochreous or greyish to brown, sometimes with reddish tinge, often obscured by a violet suffusion ; subterminal line ending before costa against a well defined reddish patch ; orbicular and reniform : stigmata hardly discernible ; forewing underside black area emanating from wing-base ending along subterminal line (feebly indicated on costa) with short projections between veins or. rarely, irregularly diffuse at end when shorter hindwing ; upperside : fringes yellow throughout. 26 ©Societas Europaea Lepidopterologica; download unter http://www.biodiversitylibrary.org/ und www.zobodat.at B2. Wide fascia 1 : forewing upperside : brown, covered by a violet suffusion or sometimes, in the south-eastern area of distribution, brilliant salmon-red, especially in the female ; subterminal line ending before costa against a well defined reddish patch ; orbicular and reniform stigmata indicated by a white outline ; forewing underside : black area emanating from wing-base extending beyond subterminal line or, rarely, ending along it with cavities between veins ; hindwing upperside : fringes yellow but brown at apex in the male. B3. Wide fascia 2 : sexually dimorphic in colour of forewing upperside : ground-colour dark ash-grey to sooty brown in the male, pale reddish brown in the female, without violet suffusion ; subterminal line widening proximally on costa, gradually reddish ; orbicular and reniform stigmata mostly inconspicuous but sometimes in- dicated by a yellowish outline ; forewing underside : black area emanating from wing-base extending beyond subterminal line ; hindwing upperside : fringes yellow but brown at apex in male. In the male genitalia differences have been found only in the vesica. All other structures are apparently identical. The everted vesica is asymmetrical, subtriangular when viewed dorso-ventrally (best seen in Fig. 15). At the angle pointing upwards, or left, in the figures, it possesses a cornutus-like sclerotization and on the ventral surface (towards the observer of the figures) a diverticulum. The following differences are correlated with the wing characters : CI. Narrow fascia : angular sclerotization with apex blunt ; divertic- ulum inserted on the whole anterior part of ventral side of vesica, 45° directed about to the right (downwards in the figure) ; anterior side of diverticulum convex (Fig. 12). C2. Wide fascia 1 : angular sclerotization with apex blunt ; diverticulum inserted on the whole anterior part of ventral side of vesica, 45° directed about to the right (as in narrow fascia) ; anterior side of diverticulum straight when viewed dorsoventrally (Fig. 13). C3. Wide fascia 2 : angular sclerotization sometimes with apex blunt but often cylindrical or finger-like ; diverticulum inserted on the left part of ventral side of vesica, directed ventrally (towards the observer), becoming compressed when preparing the structure between slide and coverslip (Fig. 14), if not forced downwards first (Fig. 15), showing a circular insertion. The female genitalia have a cylindrical ductus bursae ; the bursa is bent towards the right posteriorly, leading into a sac-like structure directed orally ; the ductus seminalis is connected to a bulb at the 27 ©Societas Europaea Lepidopterologica; download unter http://www.biodiversitylibrary.org/ und www.zobodat.at left posteriorly. The bursa is collapsed in unmated specimens, the membrane with a regular pattern of longitudinal folds whereas it is expanded with suppression of the folds in mated specimens ; seventh abdominal segment strongly sclerotized but without differentiating characters. The following differences are correlated with the wing characters : Dl. Narrow fascia : anterior part of bursa long, slender ; bulb narrow, directed towards the left (Fig. 16). 1 : D2. Wide fascia anterior part of bursa relatively short and wide ; less bulb of varying* width, directed more or clearly in oral direction (Fig. 17). : D3. Wide fascia 2 anterior part of bursa relatively short and wide ; bulb broad, directed towards the left (Fig. 18). It is advantageous for the comparison of the bursa and especially of the bulb in unmated specimens to blow up the bursa first with water and then with alcohol with the help of a syringe through the ductus bursae, touching the bulb on the outside for a correct expansion. If the pressure is sufficiently high it is possible to obtain a permanent expansion nearly as good as in mated specimens. It can be difficult to judge the shape and the direction of the bulb in mated specimens when deformed by an intruding spermatophore. No differences have been found in other parts or in the size. It is evident from these differences and correlations that there are three species. It was necessary to discuss the morphology first, in order to clarify the complex nomenclatural situation. Several available names have been erected in the complex. They will be discussed in chronological order. Nomenclature Phalaena (Noctua) janthina [Denis & Schiffermüller] 1775, Ankündung eines systematischen Werkes von den Schmetterlingen der Wienergegend : 78, "Unbekfannte] Rfaupe]. Veilblaulichte braunfleckigte E[ule]". Type locality : [Austria :] "Wienergegend" by implication. Type material destroyed (Horn & Kahle 1935-37 : 243). "Veilblaulichte braunfleckigte Eule" (blue-violet brown-spotted-noctuid moth), formally the German name of the species, is a rather deceptive and brief description which could apply to either of the two species "narrow fascia" and "wide fascia 1". As the type locality is situated within the distribution area of both species, it cannot be decided for which species the name should be used, even if
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